1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Shared Memory Communications over RDMA (SMC-R) and RoCE 4 * 5 * Monitoring SMC transport protocol sockets 6 * 7 * Copyright IBM Corp. 2016 8 * 9 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/types.h> 15 #include <linux/init.h> 16 #include <linux/sock_diag.h> 17 #include <linux/inet_diag.h> 18 #include <linux/smc_diag.h> 19 #include <net/netlink.h> 20 #include <net/smc.h> 21 22 #include "smc.h" 23 #include "smc_core.h" 24 25 static void smc_gid_be16_convert(__u8 *buf, u8 *gid_raw) 26 { 27 sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x", 28 be16_to_cpu(((__be16 *)gid_raw)[0]), 29 be16_to_cpu(((__be16 *)gid_raw)[1]), 30 be16_to_cpu(((__be16 *)gid_raw)[2]), 31 be16_to_cpu(((__be16 *)gid_raw)[3]), 32 be16_to_cpu(((__be16 *)gid_raw)[4]), 33 be16_to_cpu(((__be16 *)gid_raw)[5]), 34 be16_to_cpu(((__be16 *)gid_raw)[6]), 35 be16_to_cpu(((__be16 *)gid_raw)[7])); 36 } 37 38 static void smc_diag_msg_common_fill(struct smc_diag_msg *r, struct sock *sk) 39 { 40 struct smc_sock *smc = smc_sk(sk); 41 42 r->diag_family = sk->sk_family; 43 if (!smc->clcsock) 44 return; 45 r->id.idiag_sport = htons(smc->clcsock->sk->sk_num); 46 r->id.idiag_dport = smc->clcsock->sk->sk_dport; 47 r->id.idiag_if = smc->clcsock->sk->sk_bound_dev_if; 48 sock_diag_save_cookie(sk, r->id.idiag_cookie); 49 if (sk->sk_protocol == SMCPROTO_SMC) { 50 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src)); 51 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst)); 52 r->id.idiag_src[0] = smc->clcsock->sk->sk_rcv_saddr; 53 r->id.idiag_dst[0] = smc->clcsock->sk->sk_daddr; 54 #if IS_ENABLED(CONFIG_IPV6) 55 } else if (sk->sk_protocol == SMCPROTO_SMC6) { 56 memcpy(&r->id.idiag_src, &smc->clcsock->sk->sk_v6_rcv_saddr, 57 sizeof(smc->clcsock->sk->sk_v6_rcv_saddr)); 58 memcpy(&r->id.idiag_dst, &smc->clcsock->sk->sk_v6_daddr, 59 sizeof(smc->clcsock->sk->sk_v6_daddr)); 60 #endif 61 } 62 } 63 64 static int smc_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb, 65 struct smc_diag_msg *r, 66 struct user_namespace *user_ns) 67 { 68 if (nla_put_u8(skb, SMC_DIAG_SHUTDOWN, sk->sk_shutdown)) 69 return 1; 70 71 r->diag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); 72 r->diag_inode = sock_i_ino(sk); 73 return 0; 74 } 75 76 static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb, 77 struct netlink_callback *cb, 78 const struct smc_diag_req *req, 79 struct nlattr *bc) 80 { 81 struct smc_sock *smc = smc_sk(sk); 82 struct smc_diag_fallback fallback; 83 struct user_namespace *user_ns; 84 struct smc_diag_msg *r; 85 struct nlmsghdr *nlh; 86 87 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 88 cb->nlh->nlmsg_type, sizeof(*r), NLM_F_MULTI); 89 if (!nlh) 90 return -EMSGSIZE; 91 92 r = nlmsg_data(nlh); 93 smc_diag_msg_common_fill(r, sk); 94 r->diag_state = sk->sk_state; 95 if (smc->use_fallback) 96 r->diag_mode = SMC_DIAG_MODE_FALLBACK_TCP; 97 else if (smc->conn.lgr && smc->conn.lgr->is_smcd) 98 r->diag_mode = SMC_DIAG_MODE_SMCD; 99 else 100 r->diag_mode = SMC_DIAG_MODE_SMCR; 101 user_ns = sk_user_ns(NETLINK_CB(cb->skb).sk); 102 if (smc_diag_msg_attrs_fill(sk, skb, r, user_ns)) 103 goto errout; 104 105 fallback.reason = smc->fallback_rsn; 106 fallback.peer_diagnosis = smc->peer_diagnosis; 107 if (nla_put(skb, SMC_DIAG_FALLBACK, sizeof(fallback), &fallback) < 0) 108 goto errout; 109 110 if ((req->diag_ext & (1 << (SMC_DIAG_CONNINFO - 1))) && 111 smc->conn.alert_token_local) { 112 struct smc_connection *conn = &smc->conn; 113 struct smc_diag_conninfo cinfo = { 114 .token = conn->alert_token_local, 115 .sndbuf_size = conn->sndbuf_desc ? 116 conn->sndbuf_desc->len : 0, 117 .rmbe_size = conn->rmb_desc ? conn->rmb_desc->len : 0, 118 .peer_rmbe_size = conn->peer_rmbe_size, 119 120 .rx_prod.wrap = conn->local_rx_ctrl.prod.wrap, 121 .rx_prod.count = conn->local_rx_ctrl.prod.count, 122 .rx_cons.wrap = conn->local_rx_ctrl.cons.wrap, 123 .rx_cons.count = conn->local_rx_ctrl.cons.count, 124 125 .tx_prod.wrap = conn->local_tx_ctrl.prod.wrap, 126 .tx_prod.count = conn->local_tx_ctrl.prod.count, 127 .tx_cons.wrap = conn->local_tx_ctrl.cons.wrap, 128 .tx_cons.count = conn->local_tx_ctrl.cons.count, 129 130 .tx_prod_flags = 131 *(u8 *)&conn->local_tx_ctrl.prod_flags, 132 .tx_conn_state_flags = 133 *(u8 *)&conn->local_tx_ctrl.conn_state_flags, 134 .rx_prod_flags = *(u8 *)&conn->local_rx_ctrl.prod_flags, 135 .rx_conn_state_flags = 136 *(u8 *)&conn->local_rx_ctrl.conn_state_flags, 137 138 .tx_prep.wrap = conn->tx_curs_prep.wrap, 139 .tx_prep.count = conn->tx_curs_prep.count, 140 .tx_sent.wrap = conn->tx_curs_sent.wrap, 141 .tx_sent.count = conn->tx_curs_sent.count, 142 .tx_fin.wrap = conn->tx_curs_fin.wrap, 143 .tx_fin.count = conn->tx_curs_fin.count, 144 }; 145 146 if (nla_put(skb, SMC_DIAG_CONNINFO, sizeof(cinfo), &cinfo) < 0) 147 goto errout; 148 } 149 150 if (smc->conn.lgr && !smc->conn.lgr->is_smcd && 151 (req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) && 152 !list_empty(&smc->conn.lgr->list)) { 153 struct smc_diag_lgrinfo linfo = { 154 .role = smc->conn.lgr->role, 155 .lnk[0].ibport = smc->conn.lgr->lnk[0].ibport, 156 .lnk[0].link_id = smc->conn.lgr->lnk[0].link_id, 157 }; 158 159 memcpy(linfo.lnk[0].ibname, 160 smc->conn.lgr->lnk[0].smcibdev->ibdev->name, 161 sizeof(smc->conn.lgr->lnk[0].smcibdev->ibdev->name)); 162 smc_gid_be16_convert(linfo.lnk[0].gid, 163 smc->conn.lgr->lnk[0].gid); 164 smc_gid_be16_convert(linfo.lnk[0].peer_gid, 165 smc->conn.lgr->lnk[0].peer_gid); 166 167 if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0) 168 goto errout; 169 } 170 if (smc->conn.lgr && smc->conn.lgr->is_smcd && 171 (req->diag_ext & (1 << (SMC_DIAG_DMBINFO - 1))) && 172 !list_empty(&smc->conn.lgr->list)) { 173 struct smc_connection *conn = &smc->conn; 174 struct smcd_diag_dmbinfo dinfo = { 175 .linkid = *((u32 *)conn->lgr->id), 176 .peer_gid = conn->lgr->peer_gid, 177 .my_gid = conn->lgr->smcd->local_gid, 178 .token = conn->rmb_desc->token, 179 .peer_token = conn->peer_token 180 }; 181 182 if (nla_put(skb, SMC_DIAG_DMBINFO, sizeof(dinfo), &dinfo) < 0) 183 goto errout; 184 } 185 186 nlmsg_end(skb, nlh); 187 return 0; 188 189 errout: 190 nlmsg_cancel(skb, nlh); 191 return -EMSGSIZE; 192 } 193 194 static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb, 195 struct netlink_callback *cb) 196 { 197 struct net *net = sock_net(skb->sk); 198 struct nlattr *bc = NULL; 199 struct hlist_head *head; 200 struct sock *sk; 201 int rc = 0; 202 203 read_lock(&prot->h.smc_hash->lock); 204 head = &prot->h.smc_hash->ht; 205 if (hlist_empty(head)) 206 goto out; 207 208 sk_for_each(sk, head) { 209 if (!net_eq(sock_net(sk), net)) 210 continue; 211 rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc); 212 if (rc) 213 break; 214 } 215 216 out: 217 read_unlock(&prot->h.smc_hash->lock); 218 return rc; 219 } 220 221 static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 222 { 223 int rc = 0; 224 225 rc = smc_diag_dump_proto(&smc_proto, skb, cb); 226 if (!rc) 227 rc = smc_diag_dump_proto(&smc_proto6, skb, cb); 228 return rc; 229 } 230 231 static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 232 { 233 struct net *net = sock_net(skb->sk); 234 235 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY && 236 h->nlmsg_flags & NLM_F_DUMP) { 237 { 238 struct netlink_dump_control c = { 239 .dump = smc_diag_dump, 240 .min_dump_alloc = SKB_WITH_OVERHEAD(32768), 241 }; 242 return netlink_dump_start(net->diag_nlsk, skb, h, &c); 243 } 244 } 245 return 0; 246 } 247 248 static const struct sock_diag_handler smc_diag_handler = { 249 .family = AF_SMC, 250 .dump = smc_diag_handler_dump, 251 }; 252 253 static int __init smc_diag_init(void) 254 { 255 return sock_diag_register(&smc_diag_handler); 256 } 257 258 static void __exit smc_diag_exit(void) 259 { 260 sock_diag_unregister(&smc_diag_handler); 261 } 262 263 module_init(smc_diag_init); 264 module_exit(smc_diag_exit); 265 MODULE_LICENSE("GPL"); 266 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */); 267